(三选一)【化学与技术】 2011年8月12日,网上传云南曲靖市越州镇有总量50

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问题:

(三选一)【化学与技术】

2011年8月12日,网上传云南曲靖市越州镇有总量5000余吨的重毒化工废料铬渣由于非法丢放,毒水被直接排放南盘江中。

Ⅰ:某工厂对制革工业污泥中Cr(III)回收与再利用工艺如下(硫酸浸取液中金属离子主要是Cr3+,其次是Fe3+、Al3+、Ca2+、Mg2+

部分阳离子常温下以氢氧化物形式沉淀时溶液的pH见下表

(1)实验室用18.4 mol/L的浓硫酸配制250 mL 4.8 mol/L的硫酸溶液,所用的玻璃仪器除烧杯、玻璃棒和吸量管(一种能精确量取一定体积液体的仪器)外,还需____________。   

(2)酸浸时,为了提高浸取率可采取的措施是______________(至少答一点)。 

(3)加入H2O2的作用是__________________________,调节溶液的pH=8是为了除去_________离子。   

(4)钠离子交换树脂的原理为:Mn+nNaR→MRn+nNa,被交换的的杂质离子是____________。

(5)还原过程发生以下反应(请配平):  _____Na2Cr2O7+_____SO2+____   ________ = ____ Cr(OH)(H2O)5SO4+_______Na2SO4

Ⅱ:工业废水中常含有一定量的Cr2O72-和CrO42-,它们会对人类及生态系统产生很大损害,必须进行处理。其中一种处理方法为电解法:该法用Fe做电极,电解含Cr2O72-的酸性废水,随着电解进行,阴极附近溶液pH升高,产生Cr(OH)3沉淀。

(6)阳极的电极反应式为_______________。在阴极附近溶液pH升高的原因是(用电极反应方程式解释)__________。

考点:工业生产其他物质(工业制备碳酸锂,硫酸钡等化工原理)
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20世纪推行福利国家的北欧五国是冰岛、芬兰、丹麦、挪威和瑞士。 [ ]

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图为某大陆多年平均1月、7月海平面气压(单位:百帕)分布图。读图,回答下题。

小题1:导致该大陆a月、b月气压状况不同的主要原因是

①海陆热力性质差异 ②太阳直射点的回归运动 ③地形起伏 ④洋流分布

A.①②

B.②③

C.①④

D.③④小题2:a月可能出现

A.华北平原的冬小麦正值返青

B.加拿大南部万叶飘丹

C.天山冰川储量为全年较小值

D.欧洲北部多降雪天气

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The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage.

The collapse of the stock "bubble" of Internet-related companies in 2000-2001 has resulted in more than its fair share of analysis, hand-wringing, and finger-pointing. A panel discussion at a recent Technology Today conference in Santa Monica produced a heated debate between two former luminaries of the dot.corn world: investment banker Pat Verhofen and Sue Mickelson, founder and CEO of Internet retailer Frizbeez.com.

Verhofen fired the opening shot by placing blame for the collapse of Internet stocks on the shoulders of Internet entrepreneurs who aggressively promoted ideas without viable business models. These entrepreneurs were both irresponsible and deceptive, Verhofen argued, to take investors’ money to fund operations that could not reasonably turn a profit, such as giving computers away for free or selling bulky objects, such as dog food or furniture, over the Internet. Many of these companies, he suggested, were little more than arrangements of smoke and mirrors designed to separate investors from their money.

Mickelson responded that Verhofen was like a fox in a henhouse blaming the rooster for all the dead chickens. Entrepreneurs cannot be blamed, she argued, for trying to make money for themselves and other people, because that is what entrepreneurs do. She also stated that you cannot know what ideas will or will not work until you try them; contemporaries of the Wright brothers said that a heavier-than-air aircraft could never work, and look at the skies today.

Mickelson instead placed the blame on the unscrupulous bankers and fund managers who hyped Internet stocks in order to cash in on fees from IPOs and trades. In contrast to entrepreneurs, these financial types actually do have a responsibility to offer only sound financial advice to their clients. If anyone should bear the blame, she argued, it should be people like Pat Verhofen.

Indigo Smith, the moderator of the panel, responded that perhaps the true fault lay with the common investors, who should not have invested in technology stocks in the first place if they lacked the knowledge to do so properly. While she expressed sympathy for those elderly investors who lost substantial portions of their retirement savings on flimsy Internet stocks, she observed that no one forced them to invest in those stocks.

Which of the following statements presents the pest conclusion one could draw based on the information given in the passage ?()

A. The collapse of the Internet stock "bubble" drove thousands of investors into bankruptcy.

B. People involved with the Internet do not all agree on which party bears the most responsibility for the collapse of the Internet stock "bubble."

C. Of all parties involved with the Internet, financial professionals such as investment bankers and fund managers derived the most profits from the stock "bubble."

D. The Internet stock "bubble" could not have occurred if entrepreneurs had been honest about the true financial prospects of their companies.

E. The average investor has no one to blame but himself or herself if he or she invested in an Internet stock without adequately understanding the true financial prospects of the companies in question.

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OSI七层协议中,传输层传送数据的单位为()

A.比特

B.帧

C.分组

D.信息

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总支出-(经常收入+债务收入)=()。

A.原始赤字

B.软赤字

C.硬赤字

D.总预算赤字

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